The Yates Oil Field is a giant oil field in the Permian Basin of west Texas. Primarily in extreme southeastern Pecos County, it also stretches under the Pecos River and partially into Crockett County. Iraan, on the Pecos River and directly adjacent to the field, is the nearest town. The field has produced more than one billion barrels of oil, making it one of the largest in the United States, and in 2009 it remains productive, though at a diminished rate. Since fracturing has exploded in the Permian Basin, the Yates field has seen very heavy activity in the past 3 years.